<正>采用样方调查的方法对扬州市建城区园林绿地的树木进行每木调查，按照树种在样方中出现的频度、株数百分比以及树种的健康状况进行加权平均，获得各树种的综合表现，并进行树种间的关联分析。结果表明：桂花、龙柏、女贞、银杏、碧桃、香樟、垂柳可作为扬州市城市绿地的基调树种。而根据树种间的关联性得出的扬州城市绿地植物群落的最佳树种组合、4组较佳组合及5组参考组合，与各树种的综合表现评价大体一致，符合植物的生态习性，且与植物配置的基本原则相符，可作为扬州城市绿地植物群落树种选择的依据。

A double acicular electrostatic device was designed. Experiments were conducted with an experimental model established. Results show that electrostatic spraying technique provides with a series of advantages, such as improving the droplets atomizing uniformity, increasing the droplet deposition on objects. It not only reduces the loss of agricultural chemicals and the pesticide pollution, but also saves agricultural chemicals and improves prevention effect by increasing spraying breath.